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Lenovo ThinkSystem SD650-N V2

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Lenovo ThinkSystem SD650-N V2dense node2 × SFF 2.5" bays

The Lenovo ThinkSystem SD650-N V2 is a direct water-cooled GPU compute tray that combines dual 3rd Gen Intel Xeon Scalable processors with four NVIDIA HGX A100 SXM4 GPUs. Utilizing Lenovo Neptune direct water cooling, it cools both CPUs and 500W SXM4 GPUs with warm water, packing dense AI supercomputing into standard data center racks.

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Specifications

BrandLenovo
FamilyThinkSystem SD
Form factordense node
ReleasedNov 2020
ProcessorUp to 2x 3rd Gen Intel Xeon Scalable processors up to 40 cores each (up to 250W TDP)
Memory16x DDR4 DIMM slots supporting up to 1TB DDR4-3200 ECC RDIMM
Drive baysUp to 2x 2.5-inch 7mm NVMe SSDs plus dual M.2 boot support
Gpu support4-way NVIDIA HGX A100 (40GB or 80GB) SXM4 interconnected via 600 GB/s NVLink
Expansion slotsUp to 4x PCIe 4.0 x16 slots dedicated to 200Gb/s HDR InfiniBand cards
NetworkDirect PCIe 4.0 InfiniBand connections for 1:1 GPU-to-HCA fabric topology
Power supplyShared busbar DC power from the DW612 Enclosure
ManagementLenovo XClarity Controller (XCC)

Compatible parts

SSDs

Works together

How the Lenovo ThinkSystem SD650-N V2 connects to servers, storage and the network: 5 ways, with the parts and products on each path.

Fibre Channel SANiSCSI and NVMe/TCP over EthernetDirect-attached SASFile storage (NFS and SMB)GPU cluster fabric

Fibre Channel SAN

Match the speed: 16Gb and 32Gb FC HBAs, switches and array ports work together, and each generation also runs one or two speeds below its own (a 32Gb port runs at 16Gb and 8Gb).

Adapters for the server (check the fit list)

Switches

Storage

Optics

Fibre Channel SAN: how it fits together

iSCSI and NVMe/TCP over Ethernet

Keep the speed the same at all three points: a 25GbE server, a 25GbE switch port and a 25GbE array port. Mixed speeds work but the slowest link sets the pace.

Adapters for the server (check the fit list)

Switches

Storage

Optics

iSCSI and NVMe/TCP over Ethernet: how it fits together

Direct-attached SAS

12Gb SAS uses Mini-SAS HD (SFF-8644) connectors; older 6Gb gear uses Mini-SAS (SFF-8088). Adapter cables exist, but the link runs at the slower speed.

Adapters for the server (check the fit list)

Storage

Direct-attached SAS: how it fits together

File storage (NFS and SMB)

Front-end ports face the clients; back-end ports (on scale-out systems) connect the nodes to each other and need their own switch pair.

Adapters for the server (check the fit list)

Switches

Storage

Optics

File storage (NFS and SMB): how it fits together

GPU cluster fabric

InfiniBand adapters and switches must match the generation: HDR is 200Gb, NDR is 400Gb. VPI adapters such as ConnectX-6 and ConnectX-7 can run either InfiniBand or Ethernet.

GPUs

Adapters for the server (check the fit list)

Switches

GPU cluster fabric: how it fits together

Plan and size it

Check compatibility with Lenovo

Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Lenovo has tested with the Lenovo ThinkSystem SD650-N V2.

Equivalent models from other brands

FAQ

How are the NVIDIA A100 GPUs cooled in the SD650-N V2?

Direct water cold plates mount on top of all four A100 SXM4 modules and the NVSwitch chips, transferring heat to the liquid loop.

What rack density does SD650-N V2 achieve?

A single 42U rack can house up to 36 compute nodes containing 144 NVIDIA A100 GPUs.

Buying or selling ThinkSystem SD650-N V2?

New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.

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